Near-Field Coupling and Mode Competition in Multiple Anapole Systems

Abstract

All-dielectric metamaterials are a promising platform for the development of integrated photonics applications. In this work, we investigate the mutual coupling and interaction of an ensemble of anapole states in silicon nanoparticles. Anapoles are intriguing non-radiating states originated by the superposition of internal multipole components which cancel each other in the far-field. While the properties of anapole states in single nanoparticles have been extensively studied, the mutual interaction and coupling of several anapole states have not been characterized. By combining first-principles simulations and analytical results, we demonstrate the transferring of anapole states across an ensemble of nanoparticles, opening to the development of advanced integrated devices and robust waveguides relying on non-radiating modes.

Nonradiating photonics with resonant dielectric nanostructures

“…Complex wave mixing effects were also considered by using non radiating states in [128], which reported Four Wave Mixing (FWM) in a similar structure of [109], and composed of a germanium nanodisk (200 nm of thickness and 625 nm of radius) in which two incident waves at different frequencies ( 1 and 2 ) give rise to four waves (3 1 , [38,117,[121][122][123][124].…”

Anapole Mode Sustaining Silicon Metamaterials in Visible Spectral Range

“…Primarily, because of the ability to concentrate strong electromagnetic fields inside a point nonradiating source or scatterer and ensuring the suppression of radiation in an external field. Therefore, metamaterials with anapole mode demonstrated extremely high Q‐factor so that manifested themselves as perfect resonator …”

“…Therefore, metamaterials with anapole mode demonstrated extremely high Q-factor so that manifested themselves as perfect resonator. [21][22][23][24][25][26][27][28][29][30] All these properties lead to extensive research of all-dielectric and, particularly, silicon metamaterials and their many applications. 2D metamaterials or metasurfaces stand out due to the simplicity of fabrication and exhibits desirable optical properties.…”

Toroidal Dipole Mode Observation In Situ

“…Namely, poloidal currents, flowing along the meridians on the torus‐like objects, generate magnetic moments that circulate inside the torus, and altogether they create toroidal moments oscillating along the torus main axis . Apparently, the main interest on toroidal moment is underpinned by their contribution to more promising anapole mode excitations that take place due to destructive interference between electric and toroidal multipoles of the same order, leading to such effects as strong field localization inside the even point‐like sources and invisibility to external observer . The works of the last decade point out to feasibility of this effect in structures from microwaves to optics and demonstrate such effects as novel types of transparency, optical invisibility, and cloaking .…”

“…[14][15][16][17][18][19][20][21][22] Apparently, the main interest on toroidal moment is underpinned by their contribution to more promising anapole mode excitations that take place due to destructive interference between electric and toroidal multipoles of the same order, leading to such effects as strong field localization inside the even point-like sources and invisibility to external observer. [10][11][12][13]17,[23][24][25][26][27][28][29][30][31][32] The works of the last decade point out to feasibility of this effect in structures from microwaves to optics and demonstrate such effects as novel types of transparency, [23] optical invisibility, [27,33] and cloaking. [34] These properties are promising since they open the way to novel sensing, modulating techniques, switching possibility between multipoles, high Q-factor resonance of Fano types, and demonstration of planar THz metamaterials as 2D Ising model.…”